# CVE-2026-94504 — kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder

> As of 2026-09-22, CVE-2026-94504 is a HIGH-severity vulnerability in kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder, CVSS v3.1 7.2, EPSS 0.4% (33.4th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-94504, most recently “Ninja Forms (CVE-2026-94504) and WPC Product Bundles (CVE-2026-93836) stored XSS flaws exploited to hijack WordPress sites”.

**Last updated:** 2026-09-22

## What is CVE-2026-94504?

Ninja Forms 3.15.3 stores an anonymous non-RTE textarea value and renders it without safe HTML encoding in the legacy submission editor. An attacker can break out of the textarea with stored script. When an Administrator opens the attacker-known direct submission URL, the script runs in the WordPress admin origin.

The record classifies CVE-2026-94504 under weakness class [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 20 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.2 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 33.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-22

## Is CVE-2026-94504 being exploited?

It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **kstover**: Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder

## How to fix CVE-2026-94504

No vendor patch reference has been recorded for CVE-2026-94504 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-94504

1 tracked threat in the Threadlinqs corpus references CVE-2026-94504, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Ninja Forms (CVE-2026-94504) and WPC Product Bundles (CVE-2026-93836) stored XSS flaws exploited to hijack WordPress sites](https://intel.threadlinqs.com/threat/TL-2026-2988) — HIGH · 2026-10-06

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [wordfence.com](https://www.wordfence.com/threat-intel/vulnerabilities/id/c599a562-5218-4b37-bcf7-0e82008a4e68?source=cve)
- [plugins.trac.wordpress.org](https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/includes/Fields/Textarea.php#L35)
- [plugins.trac.wordpress.org (Textarea)](https://plugins.trac.wordpress.org/browser/ninja-forms/trunk/includes/Fields/Textarea.php#L35)
- [plugins.trac.wordpress.org (admin metabox sub fields.html)](https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/includes/Templates/admin-metabox-sub-fields.html.php#L23)
- [plugins.trac.wordpress.org (Submission)](https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.3/includes/Database/Models/Submission.php#L205)

_Showing 5 of 6 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-94504
Full detection coverage and IOCs for threats exploiting CVE-2026-94504 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp